Taken from a communication dump of the real IO with iidx 27,
this needs to be 0x2D in order to get a fully working setup with
BIO2 and sub IO board connected.
The single byte is a specific parameter required to initialize
the IO correctly. Otherwise, it either will only work partially
or not worked at all. The full impact and meaning of that byte
is not entirely known, yet.
Turns out this is different from the generic CLEAR command used
on other ACIO devices. Has further implications when initializing
BIO2 boards for specific games, e.g. IIDX.
icex2